如何在Java中跨面板拖动组件

Question

Is it possible to drag a JLabel from one panel to another? I can only drag the label within one panel. When the label moves out of the burden, it just disappear. I don't know what to do.

Answer 1

You can easily do this in several ways. One way is to

• bump the label to the glass pane on mousePressed(...)
• drag it in the glass pane on mouseDragged(...) ,
• then drop it down to whatever container the mouse is currently over on mouseReleased(...) .

Answer 2

You will have to remove the label from its current container when you start dragging it. Normally we add it to the glass pane to allow for the illusion of been dragged across multiple components.

Take a look at My drag is better then yours for an example. I'd also recommend that you have a dig around his site, he does some nice work with drag and drop